An approach on calculation of Health Index of power transformers in Cuba
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Abstract
Power transformers (PT) are a main part of costs of electro energetic systems (EES), so it must to control its state, ageing and remnant life, in order to assess its present and future condition, which is important to take correct decisions in operation, maintenance or investments, for assure the financial optimization, the reliability and the quality of all the EES. A fault in the isolation system of a PT carry out sensitive damages, generates high repair costs and financial lost. It is impossible to execute maintenances in the paper-oil isolation system of the PT, so it must to assess its condition, in order to prevent possible faults of the PT, minimizing the risk of failures and outages. It is not economic for an old transformer to be subjected to rigorous inspections and thorough testing. A promising strategy for lifetime increase is to establish monitoring priorities and develop a strategy for their maintenance. This is why insulation systems monitoring and diagnosis has become an important part in transformers monitoring. The Health Index (HI) is used to quantify the global state of the PT, taking into account a multitude of factors. In this paper, authors make an approah to the calculation of the HI of the PT in a termal power station (TPS) in Cuba, where, doing of the actual eonomic conditions, it is not possible to execute the meassurements of all the diagnostic fators, which are used in another countries.
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